TI-2026-12913 Aliases CVE-2026-15343 GHSA-h327-qh69-cgch

Path traversal in GitHub Enterprise Server

MEDIUM 42CWE-22Published 2026-07-17 · Updated 2026-11-03

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker with code execution inside a Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/, because path validation did not check the actual write destination. The initial fix in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, and 3.17.18 was incomplete because validation checked the supplied symlink target, while the publisher wrote the file using its directory and name. Writing GitHub Actions workflow files required the Dependabot installation to have workflows: write permission. Depending on repository permissions and workflow configuration, including a relevant pull_request_target workflow or auto-merge, an injected workflow could execute with access to GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.23 and was fully fixed in versions 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01195 68th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
GitHub	Enterprise Server	3.17.0 and later; 3.18.0 and later; 3.19.0 and later; 3.20.0 and later; 3.21.0 and later; 3.22.0 and later	—	No fix listed	CNA

Enterprise Server VendorGitHub Affected 3.17.0 and later; 3.18.0 and later; 3.19.0 and later; 3.20.0 and later; 3.21.0 and later; 3.22.0 and later Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:github:enterprise_server::::::::	—	—	GitHub

cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions — — ·GitHub

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-15343
2026-10-03 Alias added: GHSA-h327-qh69-cgch
2026-11-03 Affected versions changed · CNA
2026-11-03 4 new references · CNA

References

Patch 4

Other 5

TI-2024-04632 An authentication bypass vulnerability was present in the GitHub Enterprise Server (GHES)… CVSS 4.0CRITICAL 10.0
TI-2024-00181 Unsafe Reflection in Github Enterprise Server leading to Command Injection CVSS 3.1CRITICAL 9.8
TI-2024-00466 Privilege Escalation by Code Injection in the Management Console in GitHub Enterprise Server CVSS 3.1HIGH 8.8
TI-2022-08539 Integer overflow in table parsing extension leads to heap memory corruption CVSS 3.1CRITICAL 9.8
TI-2026-34990 GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler CVSS 3.1HIGH 7.5
TI-2026-32884 GitHub Copilot CLI: Nested Bare Repository Can Execute Arbitrary Commands via core.fsmonitor CVSS 4.0HIGH 8.5

See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences